Which packaging innovation, first widely deployed during the 1980s, revolutionized military field rations by significantly extending shelf life and allowing soldiers to eat directly from the packaging?

Throughout military history, feeding troops has been as crucial as arming them. One packaging innovation revolutionized how soldiers received nutrition on the battlefield, dramatically improving combat effectiveness and military logistics. This innovation represents one of the most significant advancements in military food supply systems and continues to influence both military and civilian food packaging today. Can you identify this game-changing military food packaging development?

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Retort Pouches (MRE packaging)
Freeze-dried food packets (Space Food Technology)
Vacuum-sealed tin cans (Napoleon's Preservation Method)
Waxed cardboard K-ration boxes (WWII innovation)